120results about How to "High bending fatigue resistance" patented technology

A toothed belt includes: a belt main body in which a plurality of cords are arranged side by side in a widthwise direction of a rubber layer; a plurality of teeth portions formed at one surface of the belt main body; and a tooth cloth covering surfaces of the teeth portions. A cloth base material is obtained by impregnating a surface layer rubber composition into an original canvas and by forming a surface layer, and an adhesion layer rubber composition is attached to one surface of the cloth base material to form an adhesion layer, thus forming the tooth cloth. The rubber layer contains: HNBR including HNBR in which a Mooney viscosity at 100° C. is in a range of from 100 to 160; and a polymer alloy obtained by finely dispersing zinc methacrylate in HNBR. The rubber layer and rubber compositions preferably contain hydrogenated carboxyl NBR.

A frictional forced power transmission belt transmits power to a pulley with its belt body wound around and in contact with the pulley. At least a contact part of the belt body with a pulley is formed of a rubber composition which contains ethylene-α-olefin elastomer as a rubber component but contains substantially no short fibers and which has a rubber hardness of not less than 80 but less than 95 when measured with a type A durometer in conformity with JIS K6253.

The invention belongs to the field of composite materials and in particular relates to a laminated metal chalcogenide (LMC)/carbon nanotube (CTNs) flexible compound film material of a highly ordered structure and a preparation method thereof. The composite material comprises an ultrathin self-supporting (transparent) CNTs film substrate and an LMC film which uniformly wraps the surface thereof to form the flexible composite film material which has a nanoscale porous structure and a three-dimensional network structure of a high electric channel. The preparation method comprises the following steps: providing an alloy bracket for bearing a self-supporting CNTs film and cleaning the carried CNTs film under a heating condition with plasma; and preparing the LMC/CNTs composite functional film material from the pre-treated CNTs film at an air pressure of 0.2-2Pa and at a temperature of 30-800 DEG C by virtue of a magnetron sputtered deposition technology. According to the material provided by the invention, a crispy laminated metal chalcogenide functional two-dimensional (2D) material and one-dimensional (1D) CNTs are effectively connected to form a three-dimensional (3D) network structure of structural flexibility.

This copper-alloy wire rod and a manufacturing method therefor make it possible to inexpensively provide a copper-alloy wire rod that exhibits excellent elongation and flex-fatigue-resistance properties and can be used, for example, as a magnet wire. Said copper-alloy wire rod contains, by mass, 0.5% to 4% silver and 0.05% to 0.3% of each of at least one element selected from the group consisting of tin, manganese, zinc, indium, nickel, cobalt, zirconium, and chromium, with the remainder comprising copper and unavoidable impurities. This copper-alloy wire rod has a diameter or thickness of at most 0.1 mm and exhibits a nano-indentation hardness of at least 1.45 GPa in a region extending from the outer surface of the wire rod to a depth of at least 5% of the diameter or thickness of the wire rod, a nano-indentation hardness of less than 1.45 GPa in a central section, a tensile strength of at least 350 MPa, and an elongation of at least 7%.

The present invention is to provide a polyamide laminated film comprising a resin layer A and a resin layer B formed on at least one surface of the resin layer A,the resin layer A being composed mainly of a m-xylylene group-containing polyamide polymer (a-1) which is one prepared from monomer components containing a xylylenediamine compound as a main diamine component and an alpha,omega-aliphatic dicarboxylic acid having from 6 to 12 carbon atoms as a main dicarboxylic acid component, the xylylenediamine compound being m-xylylenediamine alone or a mixture of m-xylylenediamine and p-xylylenediamine, andthe resin layer B being mainly composed of a mixed polymer (b-3) which is a mixture of from 99 to 80% by weight of an aliphatic polyamide (b-1) and from 1 to 20% by weight of an elastomer (b-2).The laminated film is good in a gas barrier property and also in a flexural fatigue resistance and a transparency.

An aluminum alloy conductor, which has a texture in which an area ratio of grains each having a (100) plane and being positioned in parallel to a cross-section vertical to a wire-drawing direction of a wire is 20% or more, and which has a grain size of 1 to 30 μm on the cross-section vertical to the wire-drawing direction of the wire.

The invention discloses an anti-deformation co-combustion sintering fixture. The anti-deformation co-combustion sintering fixture comprises a base body. The base body comprises a base and assembling structures making contract with the surface of a to-be-sintered workpiece. The material shrinkage rate of the anti-deformation co-combustion sintering fixture is identical with or close to that of thesurface of the to-be-sintered workpiece. The material sintering temperature of the anti-deformation co-combustion sintering fixture is higher than that of the surface of the to-be-sintered workpiece.The assembling structures are a plurality of protrusions or grooves. The invention further discloses a material of the anti-deformation co-combustion sintering fixture. The material is prepared from,by weight, 50%-60% of powder, 10%-20% of water-soluble polyester, 10%-20% of polypropylene, 8%-10% of fatty acid amide phosphate, 3%-5% of a coupling agent, 0.3%-0.5% of a stabilizer and 0.2%-0.5% ofan antioxidizer. According to the anti-deformation co-combustion sintering fixture and the material thereof, sintering deformation of an injection-formed surface shell of titanium alloy powder can beprevented, the product defective rate caused by sintering deformation is greatly decreased, the productivity is improved, and the manufacturing cost is reduced.

The invention discloses an electromagnetic wave shielding film and a highly transparent strong electromagnetic wave shielding tape based on the electromagnetic wave shielding film. The invention is characterized in that the electromagnetic wave shielding film is prepared by coating electromagnetic wave shielding slurry on a transparent substrate, while the strong electromagnetic wave shielding tape is prepared based on the electromagnetic wave shielding film, wherein the electromagnetic wave shielding slurry is prepared by mixing silver nanowires, PEDOT:PSS, graphene, water-based acrylic resins, waterborne polyurethane resins, a curing agent, a small molecule dispersant, a flatting agent, an antifoaming agent and water. The electromagnetic wave shielding tape disclosed by the invention can reach the visible light transmittance of 90% or higher and is high in shielding effectiveness and wide in frequency range.

A belt for papermaking shoe presses is provided which comprises a reinforcing fibrous base (6) and a polyurethane layer (2) united therewith, the reinforcing fibrous base (6) having been embedded in the polyurethane layer (2). The belt includes a polyurethane layer obtained by curing a mixture comprising: a urethane prepolymer obtained by reacting a polyisocyanate compound selected among p-phenylene diisocyanate, 4,4'-methylenebis(phenyl isocyanate), and tolylene diisocyanate with a polyol compound selected among polypropylene glycol, polytetramethylene glycol, and a polycarbonate diol; a hardener selected among an aliphatic diol compound, hydroquinone bis-ss-hydroxyethyl ether, and organic polyamine compound; and an aliphatic triol compound. Due to this layer, the shoe press belt for papermaking is excellent in wearing resistance and flexing fatigue resistance.

This invention provides a rubber composition for a transmission belt, which can realize the manufacture of a transmission belt excellent in electroconductivity as well as in electroconductivity retaining property after running and having excellent resistance to fatigue from flexing and abrasion resistance. The rubber composition contains rubber, furnace carbon black, zinc oxide, and stearic acid. The furnace carbon black has a nitrogen adsorption specific surface area of not less than 75 m<2>/g and a DBP absorption of not less than 100 cm<3>/100g and is contained in an amount of 50 to 100 parts by mass based on 100 parts by mass of the rubber. The content of the zinc oxide is not less than 6 parts by mass based on 100 parts by mass of the rubber. The content of the stearic acid is not less than 1 part by mass based on 100 parts by mass of the rubber.

The invention discloses a cold-resistant plastic bucket and a preparation method thereof, and belongs to the technical field of a plastic packaging container. The cold-resistant plastic bucket is characterized in that the cold-resistant plastic bucket is prepared from the components in parts by weight: 60 to 80 parts of high-density polyethylene, 15 to 25 parts of linear low-density polyethylene,10 to 20 parts of maleic anhydride grafted high-density polyethylene, 5 to 7 parts of high-polymerization-degree polyvinyl chloride, 6 to 8 parts of ethylene-vinyl acetate copolymer, 0.5 to 1.0 part of ultraviolet absorption agent, 1 to 1.5 parts of antioxidant, 2 to 3 parts of plasticizer and 5 to 7 parts of silica power; the high-density polyethylene has a density of 0.936 g/cm<3> and a melt index of 1.4 g/10 min; the linear low-density polyethylene has a density of 0.920 g/cm<3> and a melt index of 1.0 g/10 min. The invention reaches the technical effect of enabling the polyethylene plasticbucket to also have excellent printing performance when having cold resistance.

A cord for rubber reinforcement of the present invention includes a core strand including a plurality of strands (A), and a plurality of strands (B) disposed around the core strand. In the core strand, the plurality of strands (A) are finally twisted, and each of the plurality of strands (A) is formed of a plurality of reinforcing fibers (A) that are primarily twisted. Each of the plurality of strands (B) is formed of a plurality of reinforcing fibers (B) that are primarily twisted, and the plurality of strands (B) are finally twisted to be disposed around the core strand. The direction of final twist of the plurality of strands (B) is the same as the direction of primary twist in at least one strand (B) selected from the plurality of strands (B). The number of primary twists in the strand (B) is greater than the number of primary twists in the strand (A), and/or the number of final twists of the strands (B) is greater than the number of final twists of the strands (A).

A hybrid cord 1 for rubber reinforcement comprises a strand 2 having higher elastic modulus, made of PBO fiber or the like, which is disposed at the center of the cord, and strands 3 having lower elastic modulus, made of glass fiber or the like, which are disposed therearound. The hybrid cord has enough strength and is excellent in flexural fatigue resistance, adhesion property relative to rubber, and dimensional stability. A rubber product employs this hybrid cord 1 for rubber reinforcement.

The invention discloses a durable PTFE diaphragm piece. The durable PTFE diaphragm piece is obtained in the manner that by mass, 70-90 parts of PTFE particles and 10-30 parts of PTFE micro powder are mixed and stirred uniformly, and then compression molding is performed. The particle size of the PTFE particles is 100-500 microns, and the particle size of the PTFE micro powder is 0.5-1.5 microns. According to the durable PTFE diaphragm piece, outstanding characteristics of heat resistance, chemical resistance and the like of common PTFE are reserved, and a great improvement is achieved in the aspects of creep resistance, bending resistance and the like. The original density of the PTFE micro powder adopted by the durable PTFE diaphragm piece is changed, the density is reduced, the flexibility of the diaphragm piece is changed to be higher, and the bending resistant capacity is higher.

The invention discloses an environment-friendly polyhydroxybutyrate-hydroxyvalerate plastic material. The environment-friendly polyhydroxybutyrate-hydroxyvalerate plastic material is composed of raw materials including, by weight part, 20-30 parts of corn starch, 10-13 parts of polyvinyl alcohol solution, 1-1.5 parts of glyoxal water solution, 7-10 parts of cashew phenolic resin, 22-24 parts of polyhydroxybutyrate-hydroxyvalerate, 8-10 parts of cellulose nanocrystal, 1.5-2 parts of silane coupling agent, 1.5-2.5 parts of dehydroacetic acid, 1.8-2.3 parts of ethyl p-hydroxybenzoate, 2-2.5 parts of di-2-ethylhexyl phthalate, 1-1.5 parts of urea, 1.8-2.5 parts of zinc stearate, 6-7 parts of epoxidized soybean oil, 8-10 parts of silk fiber, 8-10 parts of starch acetate, 15-18 parts of hard argil, 15-20 parts of talcum powder, 8-12 parts of kaolin, 8-10 parts of sepiolite, 1.5-2.5 parts of tert-butylhydroquinone, 1-1.4 parts of 2,6-di-tert-butyl-4-methylphenol, 15-18 parts of isopropanol and 16-20 parts of water.

Disclosed is a shoe press belt (10) which comprises a reinforcing fibrous base material (6) embedded in a polyurethane layer, and has an outer circumference layer (2a) and an inner circumference layer(2b) each formed with a polyurethane. The polyurethane layer constituting the outer circumference layer (2a) comprises a polyurethane which is cured by the reaction of an urethane prepolymer (A) witha curing agent mixture (B). The urethane prepolymer (A) is produced by reacting an isocyanate compound selected from p-phenylene-diisocyanate and 4,4'-methylenebis(phenylisocyanate) with a polytetramethylene glycol and has an isocyanate group at its terminal. The curing agent mixture (B) comprises 1,4-butanediol and an aromatic polyamine having an active hydrogen group (H). The shoe press belt has excellent wear resistance, cracking resistance and bending fatigue resistance.